=NZ SHOOTER VIDEO IS EXCUSE FOR EXPANDING SECRET BIG TECH CENSORSHIP EFFORTS - "BLOCKADE"=
https://www.wired.com/story/platforms-centralized-censorship/
A clue - the big social platforms are using hashes of digital files to create real-time "suppression list" of images and videos (((they))) want to censor.
Memes aren't easily "read" by computers yet. BUT once fingerprinted (a "hash" is basically a digital fingerprint) - and then added to the GIFCT database (see below) and marked as "censored" (or whatever) - it's immediately "machine readable" and can be suppressed automatically across multiple big social platforms.
To circumvent this sort of censorship scheme, one needs to alter the digital file (usually in a minimal way), so that the files new hash no longer matches the old hash - but it basically looks and acts exactly the same for human consumption.
Most "hashes" I know of changes significantly with even a minor change in file content.
To change an image's hash (a meme), it could be as easy as changing a pixel in the image, resizing, re-applying compression, applying a filter, directly editing the file header in some minor way, etc…
If the "hashing" algo is more sophisticated than the ones I'm familiar with, bigger changes to the file may be required. Sophisticated hashes take time (in additional CPU cycles), so if they are hashing "everything" as it comes across the wire - they are probably using a simple algo to match for it… even if their initial algo has more time to pick the file apart in detail.